Urey and Miller

Topics: Mammal, Water vapor, Hydrogen Pages: 3 (1178 words) Published: March 19, 2011
Preliminary biology assignment task 3
Part A
The Urey and Miller was conducted in 1952 and published in 1953 by Stanley miller, under the supervision of Harold Urey at the University of Chicago. It proposed the possible chance of the inorganic material of some of the basic building blocks of life, given that conditions resembled those of the ancient earth. This was the first ever experiment to test Alexander Oparin's and J. B. S. Haldane's hypothesis about the evolution of pre-biotic chemicals and the origin of life on Earth. They designed an apparatus that mocked the atmosphere of early Earth, Miller gathered molecules which were believed to represent the major components that were believed to be in the atmosphere and placed them into a closed system. A mix of water (H2O), methane (CH4), ammonia (NH3), and hydrogen (H2), the materials which were believed to represent the major components of the early Earth's atmosphere, was used in the experiment in order to test what kind of environment would be needed to allow life to begin. The chemicals were all sealed and circulated inside a sterile array of glass tubes and flasks connected together in a loop, with one flask half-full of liquid water and another flask containing a pair of electrodes. The liquid water was heated to add water vapour into the chemical mixture and the gases that were formed circulated around the apparatus, mimicking the Earth's atmosphere. The flask with heated water represented water on the Earth's surface and the recycled water vapor reenacted the water that evaporates from lakes and seas, before going into the atmosphere and becoming into rain. Sparks were fired between the electrodes to mimic lightning storms (which were believed to be common on the early earth) through the water vapors, and then the vapors were cooled again so that the water could condense (which simulated the oceans) and trickled back into the first water flask in a continuous cycle. The Urey and Miller experiment...

Bibliography: :
Heinemen Biology
http://www.daviddarling.info/encyclopedia/M/MillerUreyexp.html Accessed 17/7/10
http://www.accessexcellence.org/WN/NM/miller.php Accessed 17/7/10
http://www.allempires.com/article/index.php?q=The_Platypus Accessed 18/7/10
http://science.jrank.org/pages/4344/Miller-Urey-Experiment.html Accessed 18/7/10
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